Driving mechanism for work spindles



A. L. HARRINGTON DRIVING MECHANISM FOR WORK SPINDLES Filed Oct. 13, 1924 5 Sheets-Sheet Oct. 9, 192a. 1,686,746

A. L. HARRINGTO N DRIVING MECHANISM FOR WORK SPINDLES Filed Oct. 15, 1924 5 Sheets-Sheet 2 //VVENTOR g/nw V A. L. HARRINGTQN DRIVING MECHANISM FOR WORK SPINDLES Oct. 9, 1928. 1,686,743

. led Oct. 13, 1924 3 Sheets-Sheet 3 CJI Patented Oct. 9, 1928 UNITED STATES PATENT OFFICE.

ALFRED L. HARRINGTON, OF ROSSLYN FARMS, PENNSYLVANIA, ASSIGNOR TO PITTS- BURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA.

DRIVING MECHANISM FOR WORK SPINDLES.

Application filed October 13, 1924. Serial No. 743,288.

- The invention relates to drive mechanism for work spindles and more particularly for use in surfacing (grinding and polishing) glass, marble and the like, the apparatus having its greatest utility in connection wlth the grinding and polishing of sheet glass in a straight away operation to produce plate glass, in which operation, the glass sheets on trucks or carriers, are passed beneath a ser es of grinding and polishing machines. The invention has for its primary objects; the provision of an improved apparatus for use in a machine of the type specified which may be removed bodily for replacement and repair, and the provision of a unit of the k nd specified having improved means for drlvlng the runner directly from an electric motor constituting a part of the unit. The motor may be a direct current motor arranged in a variety of ways, as hereinafter set'forth, or it may be an alternating current motor, preferably a synchronous motor of special design for slow speeds, used in connection with a frequency changer for reducing the cycle of that normally employed Certain embodiments of the invention areillustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation ofthe apparatus. Fig. 2 is aplan view. Fig. 3 is a partial side elevation and partial vertical section on the line III-III of Fig. 1. Fig; 4 is a section on the line IVIV of Fig. 1. And Figs. 5 and 6 are side elevation and plan views. of a further modification.

The glass, which is to be ground and polished, is carried by a series of trucks or tables (not shown), mounted on atrack passing betions 1. 2. 3, 4 and 5. a part only of'which is f neath a series of machines of the typeof the one shown, a part of such machines. being grinding machines, to which sand and water are supplied, while another part of the machines is provided with polishing runners, having the usual felt blocks, to which a mixture of rouge and water is supplied.

Referring to the drawings, the framework of the machine consists of the commercial sec shown. Secured to this framework, is a cast- 'ing 6, upon which the removable surfacing unit, about to be described,-is mounted and guided for vertical movement by means of the at 8, and the arm 9 pivoted runner shaft or spindle 12, the runner 13, and

the motor armature 14. The motor casing consists of the two sections and 16, hinged together as indicated at 17 in Fig. 4, and carrying motor field consisting of two field coils,

arranged so as to produce the four poles 1 8,

18 and 19, 19. The casing 15 is bolted to the casting 6, and when the section 16 is in closed position the sections are secured by means of the pivoted locking bolt 20. The armature is provided with a suitable commutator '14 to which the usual brushes (not shown) are applied, andabov'e this commutator is a shield 21 to protect the commutator from dirt and oil.v The motor, in this instance, is of the direct current type and designed to run at the relatively slow speed required for a grinding or polishing machine.

The supporting member 11 preferably consists of the end blocks 22 and 23, carrying the roller bearings 24 and 25, and a connecting frame integral with the block 23 and comprising theribs 26, 26 and the annular end part 27, bolted to the block 22. The end blocks also carry the trunnionsv 28 and 29, which are engaged by the hook shaped ends of the lever 7, and pivoted guide arm 9, such parts being made in forked form, as indicated in Fig. 2, so as to straddle the blocks 22 and 23. Blocks or caps 30serve to retain the trunnions 28 in the hook shaped ends of the lever 7.

If it becomes necessary tore pair or replace the runner 13, or any part of the unit, this is easily accomplished by releasing the bolt 20 and swinging the casing section 16 open, after which the entire unit may be removed laterally by engaging the eye bolt 31 with an overhead crane, after which a new unit may be positioned without awaiting the repair of the old one.

Counter-balancing means are provided for the lever 7, in the form of the spring 32. I whose tension may be adjusted by means of Figs. 5 and 6 illustrate another form of unit of the direct current type employing a hinged section to permit the removal laterally of the runner with its shaft and the armature carried thereby. In this construction, there are fourip'oles 43. 44, 45 and 46,

but only two field coils 47 and 48 around the poles 43 and 44. The poles 43, 44 and 45 are carried by the steel casting 49 fixed to the commercial sections 50 and 51 constitut ing a part of'the framework of the machine as in the other types of construction. The pole member 46 is integral with-the steel plate 52, hinged at one edge as indicated at 53 and secured at'the other edge by the stud bolts 54. The plate 52 also carries a pair of standards 55,55 of non-magnetic metal having at their ends the triangular steel'tips 56,

56 which contact with and form a part of the poles 43 and 44 when'the parts are in the relation indicated in full lines. Thearma-ture 57 is carried by the runner. shaft or spindle 58, which also carries the runner 59. The

shaft 58 is carriedby the bearings 60 and 61 having the lateral trunnions 62 and 63 engaged respectivelyby the arm 64 and sup: porting lever 65 as in the other types of con struction. v

When it is necessary to remove the shaft and runner supported from above by a crane having engagement with the hook 66, the

belts 54 are removed and the plate 52 swung laterally to the position indicated in dotted lines.

' This form of construction has the advantage over the form of Figs. 1 to 4, that there is no disturbance of electrical connections in swinging the member 52 outward, as is the case in the construction of Figs. 1 to. 4, in

which the swinging part carries two of'the field windings. 'Theweight carried by the swinging part is also less, and the dimension m (Flg. 6) is less than the corresponding dimension in the construction of Figs. 1 to 4,

since the length of the poles 45 and 46 can,

be reduced, due to the fact that they carry no windings. This is an advantage under certain conditions where the clearance space on the outer side of the machine is a consideration.

What I claim is: I

1. In combination, a supporting framework, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings one above the armature and one below, in which the shaft is journalled, releasable means carried by the framework arranged to guide the shaft-and bearings vertically, cans for counterbalancing the shaft with its armature andvbearings, a motor field frame surrounding the armature and secured to said framework, and field windings carried by said motor field frame, the shaft and armature being releasably supported with respect to the motor field frame, so that they may be removed leaving'the field with its frame in position upon the framework.

2. In combination, a supporting framework, a verticaLWork spindle or shaft, a motor armature secured to the shaft, a pair of bearings one above the armature and one besection having a. fourth pole Iow -in which the shaft is journalled, releas- I able means carried by the framework arranged to guide the shaft and bearings vertically, ,means for counterbalancing the shaft with its armature and bearings, a motor field frame surrounding the armature and secured to said framework, the said motor field frame being formedin sections, releasably secured in fixed relation, so that the sections may be separated to permit said shaft and the armature to be removed laterally therethrough. l

3. In: combination, a supporting framework, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings one above the armatureand one below,

in which the shaft is journalled, releasable means carried by the framework arranged to guide the shaft and bearings vertically, means for counterbalancing the shaft with its armature and bearings, a motor field frame sur-- rounding the armature and secured to said U shaped frame section of magnetic metal secured to the framework and partially surroundlng said armature, such section having an inner pole piece next to the framework and two side pole pieces, windings surroundmg the side pole pieces, and another frame section of magnetic metal secured releasably to the U-shaped section and having a fourth pole piece in opposition to said inner pole piece.

5. 'In combination, a supporting framework, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings one above the armature and one below, in

which the shaft is journalled, releasable means carried by the framework arranged to guide the shaft; and bearings vertically,

a U-shaped frame section of magnetic metal secured to the framework and partially surrounding said armature, such-section having an inner pole piece next to the framework and two side pole pieces, windings surrounding the sidepole pieces, and another frame section of magnetic metal, hinged at one i end to the legs of the U-shaped frame section and secured releasably at its other end to the other leg of said U-shaped section, said hinged tion to said inner pole piece. 7

6. In Combination, a supporting framepiece in opposi- Y Work, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings one above the'armature a-nd'one below, in which the shaft is j0urnalled,-releasable means carried by the framework arranged to guide the shaft and bearings vertically, a U- shaped frame section of magnetic metal secured to the framework and partiallysurrounding said armature, suchsection having an inner pole piece next to'the framework and two side pole pieces, windings surrounding the side pole pieces, and another frame section of magnetic metal secured releasably to the U-shaped section and having a fourth pole piece in opposition to said inner pole piece, said other frame section being provided with a pair of inwardly projecting arms of non-magnetic material carrying at their ends wedge shaped sections of magnetic material adapted to contact with and complete the side pole pieces. 1

7. In combination, a supporting frame-- work, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings, one above the armature, and one below, in which the shaft is'journalled, a pair of links pivoted to the frameworkone above the other and releasably pivoted to said bearings to guide the shaft vertically, means for counterbalancing one of the links, and a motor field with a supporting frame surrounding the armature and secured to said framework, the shaft and armature being releasably supported with respect to the motor field and its supporting frame so that they may be removed leaving the field with its supporting frame in position upon the'framework.

8. In combination, a supporting framework, a vertical work spindle or shaft, a motor armature secured to the shaft, a pair of bearings, one above the armature, and one below, in which the shaft is journalled, a/jpair of links pivoted to the framework one above the other and releasably pivoted to, said hearings to guide the shaft vertically, means for counterbalancing one of the links, and a motor field with a supporting frame surrounding the armature and secured to said framework, the said supporting frame for the motor field being formed in sections releasably secured in fixed relation, so that the sections may be separated-to permit said shaft and the armature to be removed laterally therethrough.

-In testimony whereof, I have hereunto subscribed my name this 10th day of Oct., 1924.

' ALFRED L. HARRINGTON. 

